User manual

Analog Inputs
Features:
• 8 Single-Ended (AI-0 to AI-7) or 4 Differential on screw terminals
• 6 Single-Ended (AI-8 to AI-13) or 3 Differential on expansion connector DB25
• 16 bit resolution
• Software programmable gains: x1, x10, x100, x1000
• Analog input ranges: 10V, 1V, 100mV, 10mV
• Instrumentation amplifier inputs
• SAR 65.000 - 85.000 Samples/s (depending on the number of enabled inputs)
Floating Inputs
To keep input resistance at a maximum, all Analog Inputs are left floating and are not artificially pulled to
0.0V. Readings from a floating input depend on sample rate and adjacent channels and will return undefined
results.
Input Signal Range
Keep in differential-mode the "Input Common-Mode Voltage" (V
cm
) and the "Input Voltage" (V
in
) within the
hexagons shown in the figures below. In single-ended-mode simply you have to stay in the setted range.
If you will not notice you get an invalid reading.
The "Input Common-Mode Voltage" is calculated as follows:
15/63